How do you add custom resolutions?

[Saga]

Setup in question: 7800GTX + 32" Sharp LCD TV (DA5U)

Problem: The LCD TV runs at a widescreen resolution of 1366x768. When I attempt to manually add that resolution to the list through the nVidia control panel it tells me that 1366x768 is an invalid resolution.

How do I force 1366x768 as a selectable resolution? (Preferably without adding a third party forceware program).

I have spent the last two hours searching google, AT, and both nVidia and eVGA's support documents and I am just dumbfounded by this.

Thank you for your time.
-Izu

 

[Lonyo]

What refresh rate did you try and add it with?
Try 60Hz if you haven't already.

 

[Saga]

The default was 60, so for the sake of just trying to get the resolution to show the only thing I changed was the resolution. Refresh is still 60.

 

[Saga]

Hm. At this point I'd almost be willing to use an extra app to get it done.. just wanna get this thing prepped for a little exhibition.

 

[wlee]

Since you're now "almost willing" to use 3rd party software, PowerStrip is the util you need.

 

[Saga]

Having briefly played with PowerStrip, it does not properly apply the settings to the HDTV Monitor and allow me to change the resolution, even after creating a custom device driver .ini and applying that forcefully.